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How reliable are the AC voltage measurements at 200 kHz? I mean, is there a systematic behavior of the measurements when we move from 10kHz to 50 KHz, then to 100 kHz, then to 200 KHz?

I ask this because I have been using other equipments and usually I detect a systematic attenuation of the reported value with increasing frequency. In some cases, I still come to a correction table (for higher frequency measurements) for the equipment (after systematically comparing the results with a more precise equipment). Can I expect the same with 2015 of the accuracy error increases with frequency in a random way?

For the cases I mentioned, it seems that the input amplifier has this behavior. On the other hand, the higher is the frequency, the higher is also the demand in terms of sampling rate/processing time and this factor can also impact the accuracy of the measurements in a non-systematic way. Any hint about the 2015 performance in this aspect?

The Model 2015 and 2016 for TRMS ACV and ACI are the same as all other 2000 series DMMs from Keithley.
They all have the same analog input and AC to DC converter for ACV and ACI.
The bandwidth is to 300kHz.
The separation in bandwidth specs is just a place where the accuracy changes over from one frequency range to another.
Other than what is in the manual that is about it.